Final answer:
The abdomen is divided into four primary quadrants: the Right Upper Quadrant (RUQ), Left Upper Quadrant (LUQ), Right Lower Quadrant (RLQ), and Left Lower Quadrant (LLQ). There is no 'middle right' or 'middle left' quadrant in this system.
Step-by-step explanation:
To describe the locations within the abdomen, healthcare providers commonly use a system of abdominal quadrants. This approach divides the abdominal cavity into four areas using one horizontal line and one vertical line that intersect at the navel. These quadrants are delineated as follows:
- Right Upper Quadrant (RUQ): This area contains organs such as the liver, gallbladder, right kidney, small portions of the stomach, and parts of the small and large intestine.
- Left Upper Quadrant (LUQ): This quadrant is home to the left lobe of the liver, the stomach, the pancreas, the left kidney, the spleen, and parts of the colon.
- Right Lower Quadrant (RLQ): The primary structures in this area include the appendix, the upper portion of the colon, and the right ovary and fallopian tube in females.
- Left Lower Quadrant (LLQ): This quadrant contains the lower portion of the colon, the left ovary and fallopian tube in females, and the left ureter.
There is no 'middle right quadrant' or 'middle left quadrant' in the typical medical division of the abdomen. The correct division refers to upper and lower quadrants on both the right and left sides. Note that in some cases, for more detailed analysis, the abdomen can also be divided into nine regions, but for the purpose of this question, we are addressing the four-quadrant system.